JPS60234140A - Friction disc - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to brake discs and accessories, and more particularly to disc keyway reinforcements that are fixed to discs without providing drilling holes in the material constituting the disc structure. Regarding.

[Conventional technology]

Although the keyway reinforcement concept of the present invention applies to discs of any material construction, the increasing use of carbon discs in aircraft and other types of disc brake assemblies is such that the keyway reinforcement concept of the present invention applies to discs of any material construction. This requires a design shape for the keyway reinforcement that compensates for this limitation. Typical prior art keyway reinforcements are disclosed in U.S. Pat.

3 to Begar, No. 904.000, R.L., No. 3, No. 907.076 to Crossman et al., R.L., No. 3, No. 927.740 to Zarembu Force, and R.
E.

No. 4,007.814 to Beger.

[Problem that the invention seeks to solve]

Although the use of keyway reinforcements of the type described in the above-mentioned patents improves the life of carbon discs,
However, conventional methods of securing these reinforcements to the periphery of the disk are not completely satisfactory. The reasons for this are (a) an increase in the weight of the reinforcement due to the long legs of the dam that correspond to the holes drilled in the disk, (b) a high reaction force generated in the hole due to the large moment arms, and (c) a reduction in the thermal expansion force. (d) due to fatigue failure and/or excessive loosening of the reinforcement due to lack of restraint with the keyway itself; .

Furthermore, prior art reinforcements must be made of special high temperature alloys. Here, such alloys need to maintain structural strength in order to have sufficient service life under the elevated temperatures of the loading conditions mentioned above; however, such alloys cannot be easily quenched. Can not do it. This, of course, results in excessive wear at the interface between the rotating wheel key and the reinforcement keyway. In addition, the relatively thin cross-sectional thickness of the steel reinforcement, which is typically formed by stamping, is not sufficiently flat or yet rigid, so the braking torque force is transferred to the carbon material around the groove with the reinforcement. Not communicating evenly.

This results in localized compressive failure and reduces the required loading area of the carbon material.

[Failure to solve the problem]

Various advantages of the present invention will become more apparent from the following specification and accompanying drawings. The friction disc of the present invention wherein the friction brake disc means has back-to-back surfaces forming an annular braking surface lying in a plane transverse to the axis of rotation of the disc, the disc having one of the aforementioned surfaces disposed at its periphery. a plurality of substantially figure-seven-shaped grooves extending laterally from one braking surface to the other, and a keyway reinforcing means is mounted in each of said one-shaped grooves, said reinforcing means extending laterally from said one-shaped groove to said one-shaped groove; a metal insert member having a circumferential shape substantially the same as the one-shaped groove and having a keyway formed to be inserted into the groove; and a retaining means is fixed to the insert member, the retaining means is configured to overlap a portion of the disc about the T-shaped groove to capture and restrain the metal insert within the groove.

[Examples and their effects]

1 and 2, 10 schematically depicts a brake disc assembly including a continuous annular friction disc or ring 12 of carbon-based material. The friction disc 12 is characterized by back-to-back surfaces 12a, 12b forming an annular braking surface lying in a plane transverse to the axis of rotation of the disc, as indicated by the arrow AX. A plurality of grooves 4 (only one shown) extend laterally through the periphery 16 of the disk 12 from one surface 12a to the other surface 12b; A reinforcement is provided in the form of a keyway that engages one of the drive keys of the torque tube.

When the keyway reinforcement is placed in the disc 12 to engage the drive key of a rotating wheel (not shown), the groove 14 is formed in the outer periphery 15a of the disc as shown. When placed in disk 12 to mate with the key of a torque tube (not shown), groove 14 extends along the inner periphery 1.6 of the hole passing transversely to the axis of rotation of disk I2.
formed within b. Therefore, the case and/or location of the groove 14 as well as the keyway reinforcement is not a limitation of the invention.

The groove 14 has a substantially T-shaped profile, with the top of the T-shaped being located radially inside the rim 6 of the disc 12. This is the same whether the groove 14 is formed within the outer circumferential edge 16a or the inner circumferential edge 161, as described above.

The ends of the T-shaped grooves, designated 14a and 14b, may of course be of any geometrical contour, some of which are shown schematically in FIGS. 3a to 3h. has been done. In any case, the end contours 14a, 14
The purpose of b is to lock the insert member of the keyway reinforcement assembly within the groove 14 and prevent it from dislodging radially outwardly from the groove;
This will be better understood from the description that follows.

The keyway reinforcement assembly is shown generally at 18 and includes an insert member 20, a retaining means 30, and a fastener 40. As can be readily seen, the insert member 20 has a substantially T-shaped outer profile that matches the shape of the groove 14 of the disc 12.

The insert 20 has a thickness t'' that is substantially the thickness of the disk 12, although this is not a requirement, and the top of the insert has the same geometric profile as the ends 14a and 14b of the groove 14, respectively. The insert 20 is further characterized by a transversely formed keyway 22 which is bored or drilled through the base of the "T-shaped". hole 28
It is divided into two legs 24 and 26 having two legs.

Insert member 20 is not a single piece of steel, and keyway 22 may be specially hardened to provide a long life as long as it cooperates with a rotating wheel or torque tube drive key in the usual manner. From the above description, it is clear that the insert member 20 is inserted into the disc groove 14.
It should be understood that it is formed in a shape that can be slid into the interior in the direction of the arrow A1. Ends 20a and 2
0b are captured in the groove ends 14a and 14b, respectively, so that the insert 20 cannot be moved out of the groove 14 in the radial direction of arrow A2.

Furthermore, the insert member 20 is further captured in the groove 14 in the transverse direction of the arrow A1 due to the retention means 30, as shown in FIG.

The retaining means 30 is stamped from a flat piece of steel and then bent into a U-groove or clip shape having legs 32 and 34 with a spacing +1d"' substantially equal to the thickness t" of the disk 12.

Each leg 32 , 34 of the retaining means 30 has holes 36 which allow the retaining means 30 to be inserted into the legs 2 of the insert 20 when inserted into the edges of the disks 12 at each end of the insert 20 .
Aligns with hole 28 of 4.26. To complete the assembly, fasteners 40 are inserted through holes 28 and secured in place.

The fasteners may, of course, be rivets, bolts or any other suitable fasteners.

As previously mentioned, the thickness "t'" of the insert 20 is not required, but may be the thickness of the disk 12. Preferably, however, the aforementioned thickness of the insert member is such that a compressive force is applied to the disc structure around the groove 14 when the retaining clip 30 is attached to the disc/insert assembly.
It is preferable that t"' be slightly smaller than the thickness of the disk I2.

In this situation, a slight preload on the disk can
In this way, the drive key torque force is transmitted to the carbon material of the disc structure over a wide range of load relationships.

The retaining means 30 are formed into U-shaped clips, which may be stamped from a flat sheet of material as shown in FIG. These clips may be formed in any number of conceivable shapes, but the width W1 is defined by the width W1 of the insert 20 in the region of the hole 28 and of the faces 12a, in order to capture the insert 20 in the groove 14;
] 21] It is important that the width is sufficient to cover the portion of the upper disk 12. Furthermore, to reduce the weight of the clip 30, the central portion 30a may be narrowed to a width W2, as shown in FIG. 2, since there is no need to cover the insert steel member 20 at the outer periphery 20c. Because groove edge 1
4 a , 141) is the insert member material end 20 a , 2
0 +), the insert member 20 has grooves 1
This is because it cannot move in the radial direction from 4.

In addition, each clip 30 has a through groove 36 for receiving a fastener 40, which may be a drilled hole, which serves to further reduce the overall weight of the clip while also 301] and when securing the fastener 40 through the insert member 20 and tissue fold 120 assembly.

5 and 6 show other embodiments of the retaining means 30 which can be applied to capture the insert member 20 within the circumferential disc groove 14. FIGS.

In FIG. 5, the clips 50 have a U-shaped profile similar to the clips 30, but they have a connection 50a between the legs 52, 54 located within the keyway 22 of the insert 20. It has been rotated 90 degrees. In such a configuration, coupling portion 50a functions as a load surface when the drive key is located therein.

Therefore, the connecting portion 50a is specially hardened to extend its life in the working capacity. The obvious advantage of this lip arrangement is that the clip 50
It does not extend beyond two peripheral edges and does not interfere with any part of the drive key device that engages with the keyway 22.

FIG. 6 shows holding means formed by flat bar-shaped members 60 placed on both sides of the disk 120. The rod members 60 are of sufficient length to extend into the area of the disc 12 on either side of the insert member 200, thereby serving to capture the insert member within the groove 14. In order not to interfere with the operation of the drive key located within the keyway 22, the rod member 60 has a U-shaped portion 60a that is slightly larger than the U-shaped keyway 22.

Although several representative embodiments and details have been shown and described for the purpose of illustrating the invention, it will be obvious to those skilled in the art that various modifications may be made within the spirit and scope of the invention. .

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of a brake disc according to the invention, showing the through groove at the circumference of the disc and the member forming the keyway reinforcement; FIG. 2 is a partial perspective view of the brake disc of FIG. 3 is a schematic diagram illustrating the various geometries of fixing the keyway reinforcement in the groove at the periphery of the disc, FIG. FIG. 4 is a plan view of the retaining means used to capture the insertion member of the keyway reinforcing means in the circumferential groove of the brake disc before it is bent into a U-shaped clip profile, and FIG. 5 is a U-shaped A perspective view of another embodiment of the clip retaining means, FIG. 6 is a perspective view of yet another embodiment of the retaining means. 10... Brake disc assembly 12...
・Friction disc 12 a, ] 21) ・Annular brake surface I4...
...Groove] 4 a, ] 41) ...Groove end J6...
・Periphery] 6 a, 161)... Outer life span and inner periphery 18... ・Key groove reinforcement assembly 20... Insert member 20 a, 201)... Insert member end 22...
・Key groove 24.26... Leg 28... Hole 30... Holding means 32.34... Leg

Claims (1)

[Claims] 1. Back-to-back surfaces forming an annular braking surface in the cross section of the rotational axis of the disc and a penetrating surface formed in the circumference of the disc from one braking surface to the other. a friction disk having a plurality of equidistant substantially single-shaped grooves extending from each other, the tops of the T-shaped grooves facing radially inward from the periphery of the disk, and A keyway reinforcing means disposed within each single-shaped groove is received in a matching relationship within the groove axially from one braking surface to the other of the disc and radially within the groove. a metal insert having a substantially T-shaped circumferential shape that fits into a single-shaped groove in the disc, the insert being formed therein and restraining movement from the disc; having a substantially U-shaped keyway facing radially outwardly of the disc, still secured to the opposite side of the insert member and in contact with the surface of the disc such that it is captured within the T-shaped groove; A friction disc having retaining means extending to. 2. The friction disk according to claim 1, wherein the disk is made of carbon-based material. 3. The friction disk according to claim 1, wherein the single-shaped groove is formed on the outer peripheral edge of the disk. 4. The friction disk according to claim 1, wherein the T-shaped groove is formed on the inner peripheral edge of the disk, which is formed by a hole passing through the rotation axis of the disk. 5. said retaining means comprises a clip of substantially U-shaped profile having a pair of opposing legs joined by a coupling portion, said legs being secured to the insert member so as to support the insert member within the 1-shaped groove; 2. A friction disc as claimed in claim 1, wherein the friction disc is provided with a disc and extends over both braking surfaces of the disc. 6. A friction disc according to claim 5, wherein the retaining means comprises a pair of U-shaped clips, each clip being located on either side of the U-shaped keyway of the insert. 7. Each said clip is rotated 90' and the keyway of the insert is moved from one braking surface of the disc to the other braking surface of the disc such that said coupling part of said clip forms a drive key loading surface in the keyway. 7. A friction disc according to claim 6, covering a . 8. The friction disc of claim 7, wherein the coupling portion of the clip is hardened to form a long-life load surface. 9. A friction disc as claimed in claim 1, in which the retaining means comprises a smooth, substantially rectangular metal member which extends through the insert and is secured to both braking surfaces of the disc by rivets. 10. The friction disk of claim 1, wherein the top of the T-shaped groove of the disk has ends of a special geometry.